diff --git a/ipykernel/ipkernel.py b/ipykernel/ipkernel.py
index 1757b8503..0e72ccdbe 100644
--- a/ipykernel/ipkernel.py
+++ b/ipykernel/ipkernel.py
@@ -452,6 +452,7 @@ def _experimental_do_complete(self, code, cursor_pos):
                         end=comp.end,
                         text=comp.text,
                         type=comp.type,
+                        signature=comp.signature,
                     )
                 )